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What is an atmosphere comparable to Earth's atmosphere?
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[QUOTE=".Scott, post: 6821364, member: 489053"] A comparison between Earth's atmosphere and that of other planets is usually tied to support for life. So a planet with something "similar to Earth's" would include parts that are within 0 to 100 Celsius and contain some CO2 and perhaps N2. It could also contain a significant portion of O2, but at that point you would probably find the use of descriptions more exclamatory than "similar to Earth's" - since significant amounts of O2 aren't likely to persist without biological activity. Nascent Oxygen can be detected in some exoplanets - but that can be from the ionization of H2O or CO2. [URL='https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4564821/']Here's an article[/URL] describing how O2 can be produced from non-biotic chemical reactions. [/QUOTE]
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What is an atmosphere comparable to Earth's atmosphere?
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